Evaluation of Pollen Quality and Self-Fertility in Selected Cultivars of Asian and European Pears

  • Monika BIENIASZ University of Agriculture in Kraków, Department of Pomology and Apiculture, 29 Listopada 54, 31-425 Kraków
  • Tomas NECAS Mendel University in Brno, Faculty of Horticulture in Lednice, Department of Fruit Growing, Valtická 337, Lednice 69144
  • Ewa DZIEDZIC University of Agriculture in Kraków, Department of Pomology and Apiculture, 29 Listopada 54, 31-425 Kraków
  • Ivo ONDRASEK Mendel University in Brno, Faculty of Horticulture in Lednice, Department of Fruit Growing, Valtická 337, Lednice 69144
  • Bożena PAWŁOWSKA University of Agriculture in Kraków, Department of Ornamental Plants, 29 Listopada 54, 31-425 Kraków

Abstract

Asian pears have become increasingly popular in the European market, but their cultivation history in Europe is rather short. Pear is a demanding species in terms of pollen – donor cultivar. The self-fertility phenomenon in Asian pear cultivars is not currently known. The study was conducted in a 6-year pear orchard (of 23 Asian and 5 European cultivars) at the Mendel University in Lednice (Czech Republic). The following traits were assessed: number of pollen grains, pollen viability, pollen grain germination, self-fertility and the pollen germination index (PGI). European cultivar – ‘Clapps Favourite’ and Asian cultivars – ‘Zao Su Li’, and ‘Shinko’ were characterized by the highest number of pollen grains (over 50,000 grains). Asian cultivar ‘Dangshansu Li’ had the lowest number of pollen grains (less than 10,000 grains). The pollen viability of Asian pears ranged between 90 and 100%. Among European pears, ‘Williams Bon Chrétien’ and ‘Clapps Favourite’ exhibited the highest pollen viability (90%), while the lowest viability was observed for the pollen of cultivars ‘Beurré Bosc’ and ‘Alexander Lucas’ pear (60-70%). Additionally, it was found that the germination capacity of the latter two cultivars was very weak (40-70%). After open– pollination all investigated cultivars exhibited greater pollen germination index (PGI) comparing to self-pollination. After the cross-pollination the percentage of pollen tubes below the 20% value at half the length of the pistil suggested a strong incompatibility between the crossed cultivars. The results clearly showed that none of the Asian cultivars are self-fertile, and they require a pollen – donor to produce fruits.

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Published
2017-09-15
How to Cite
BIENIASZ, M., NECAS, T., DZIEDZIC, E., ONDRASEK, I., & PAWŁOWSKA, B. (2017). Evaluation of Pollen Quality and Self-Fertility in Selected Cultivars of Asian and European Pears. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 45(2), 375-382. https://doi.org/10.15835/nbha45210877
Section
Research Articles